When you square a real number the answer is positive,
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The square of a positive number is positive. By the way, the square of a negative number is also positive.
A positive number times a positive number is always positive. A negative number times a negative number is always positive. Therefore, any square number will be positive. Any number to the fourth power (a square times a square) will always be positive. And so on.
It is positive.
The square root of any positive square number is always rational as for example the square root of 36 is 6 which is a rational number.
The square of a negative number is always positive. The square of -8 = 64, a rational number